Hi you can try this.To reset waste tank full error in MP730.1. Hit the "menu": Key2. Hit "Copy" Key3. Hit "#" Key4. Scroll thru the menu headings until you come to "Test Mode" - 12th heading5. Hit the "3" button- this will bring up Eprom Clear6. Hit "0" button7. Hit the "Stop" buttonCan only try then your printer go on longer but some time the other you need to clean out the waste ink it inside the printer go to open up all.

Please come back and just gave a vote, it will gave me some satisfaction to know am helping some one so I will keep on helping.
All The Best: Pineworks

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This sounds like an internal memory problem and I don't have a workaround. Before you give up, try this technique to reset the printer to factory. They are great printers once you learn this reset technique. Turn off printer. Hold down Stop/Reset button with one hand and turn printer on with other hand. After green light comes on for the ON button, press the Stop/Reset button two times and you should see the green light blink off and the orange alarm light blink "on" with the first press and then the green light comes back on for the power button and the orange light goes off with the second press (if you did it correctly). Now, you need to hold down the ON button about five seconds, then let go to shut OFF the printer. When you turn it back on, the printer should be back to the factory original condition. Make sure you set all your printer properties the way you want them again from your printer properties dialog boxes because some of the settings may have been stored in the printer's EEPROM, which you just reset to get rid of the offending alarm code.

1) With the printer power turned off but connected to a power source, while pressing the Resume/Cancel
button, press and hold the Power button.(DO NOT release the buttons.
The Power LED lights in green to indicate that a function is
selectable.)

2) While holding the Power button, release the
Resume/Cancel button. (DO NOT release the Power button.)

3) While
holding the Power button, press the Resume/Cancel button 2 times, and
then release both the Power andResume/Cancel buttons. (Each time the
Resume/Cancel button is pressed, the Alarm and Power LEDs lightalternately,
Alarm in orange and Power in green, starting with Alarm LED.)

4)
When the Power LED lights in green, press the Resume/Cancel button the
specified number of time(s)according to the function listed in the table
below. (Each time the Resume/Cancel button is pressed, the Alarm andPower
LEDs light alternately, Alarm in orange and Power in green, starting
with Alarm LED.)

You’ll need to reset your printer to clear the ink counters, after resetting it’ll not display the error code again. Follow this procedure to reset the printer--

1. Power off the printer.
2. Holding the stop/reset button, press and hold power button also. Hold both buttons together for 5 secs.
3. Still holding the power button, release the stop/reset buton, then press the stop/reset button twice.
4. Release power button (the screen should now say 'Service Mode').
5. Wait until the power button lights steady green, then press the stop/reset button three times with a 3 sec space between each press. On the 3rd press the indicator should turn steady orange.
6. Press the power button once, (the orange light should go off).
7. Open the printer and remove both cartridges. Wait for 10 seconds. Replace the cartridges and close printer. Wait for 30 seconds.
8. Press the power button, and wait until printer has shut down.
9. Press power button to power up. The printer will feed one piece of paper, then ask you to set the language.
10. The page counter is now reset.

1. Turn off printer
2. Hold down Resume button and press Power button.
3. Keep holding down Power button and let Resume button go.
4. Press Resume button 2 times then let BOTH buttons go.
5. Green lights will flash and then stop blinking.
6. When green lights are solid, press the Resume button 4 times.
7. Press the Power button and the printer should turn off, if not, press the Power button once more.
8. Your printer should respond as normal.Let me know the result.If I could be of further assistance, let me know. If this helps or solves the issue, please rate it.Thanks, Joe

(blinking every 5 seconds)
Toner Low
Indicates that the toner cartridge is nearly empty. Purchase a new toner and have it ready for when Toner Empty is indicated.
(solid)
Toner Empty
Replace the toner cartridge with a new one.
User's Manual is available at the following location:
http://www.brother-usa.com/Data/Documentation/Printer/User/UM_HL1440_1450_1470N.pdf
Hope this helps.